Phrase resembling double-dutch but weighted with a subtle importance. Emenating from lunatic fringe cult figure 'The funhead.' Often heard on various UK radio stations, most notably the now defunct TeamTalk and talk radio station talkSPORT.
If you were to ring a radio show, you would speak of something serious, then deliver a Rabba. You would say 'Rabba-Dabba Dab Dab Ding Dong Wigga Digga Dee Dee Ding dong Rabba dabba dabba ya ya ya budum budum dum woooooooooooooooooooooooooooooooooh'
The radio station would then have been Rabba'd.